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Earnings per Share | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Earnings per Share [Text Block] | Note 9 - Earnings Per Share Basic net income or loss per common share is calculated by dividing net income or loss available to common stockholders by the basic weighted-average number of common shares outstanding for the respective period. Diluted net income or loss per common share is calculated by dividing adjusted net income or loss by the diluted weighted-average number of common shares outstanding, which includes the effect of potentially dilutive securities. Potentially dilutive securities for this calculation consist primarily of non-vested RSUs, contingent PSUs, and shares into which the Senior Convertible Notes are convertible, which are measured using the treasury stock method. Shares of the Company’s common stock traded at an average closing price below the $40.50 conversion price for the three months ended March 31, 2018, and 2017, and therefore the Senior Convertible Notes had no dilutive impact. Please refer to Note 1 - Summary of Significant Accounting Policies in the Company’s 2017 Form 10-K for additional detail on these potentially dilutive securities. The following table sets forth the calculations of basic and diluted net income per common share:
| For the Three Months Ended March 31,
| 2018 |  | 2017
| (in thousands, except per share data)
Net income | $ | 317,401 |  |  | $ | 74,434 |
Basic weighted-average common shares outstanding | 111,696 |  |  | 111,258 |
Dilutive effect of non-vested RSUs and contingent PSUs | 1,183 |  |  | 71 |
Dilutive effect of Senior Convertible Notes | — |  |  | — |
Diluted weighted-average common shares outstanding | 112,879 |  |  | 111,329 |
Basic net income per common share | $ | 2.84 |  |  | $ | 0.67 |
Diluted net income per common share | $ | 2.81 |  |  | $ | 0.67 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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